Acid pickling bath device



ott. 24, 1939. C, F- FRANZWA l 2,177,101

ACID PICKLING BATH DEVICE Filed Feb. 19, 1937 Patented Oct. 24, 1939 UNITED STATES PATENT OFFECE ACID PICKLING BATH DEVICE tion of Illinois Application February 19, 1937, Serial No. 126,552

2 Claims.

This invention relates to an acid pickling bath device for pickling precious and non-precious metals, particularly of the character used in the dental and jewelry arts.

5 It is known to immerse constructions of this sort in an acid pickling bath for cleansing, Heretofore, however, the pickling baths have been heated to exceptionally high temperatures, and have been carried on under considerable fluctuations in temperature. These high temperatures result in liberation oi large amounts of vapors or acid fumes. These acid fumes have been very destructive on office equipment, particularly on chromium plating, nickel, and other metals in -the office or laboratory. Further, these fumes have been offensive and dangerous to the operators, and the liberation of such fumes has reduced the cleansing efciency of the bath. To meet these objections, hoods and exhaust connections have 0 been provided, but these devices have been complicated and expensive and have resulted in considerable loss in the vapors which are liberated from the bath.

One of the main objects of the present invention is to provide a pickling bath device which will not have the foregoing objections, and particularly a device for pickling constructions of the class described without the liberation of large amounts of vapors and acid fumes, and without undesirable iiuctuations in temperature.

Another object of the invention is to provide a pickling bath device which is constructed eiectively to utilize the heat employed, and prefer-- ably provided with a cover formed to return condensed vapors back into the bath device.

Further objects and advantages of the invention will be apparent from the following detailed description taken in connection with the accompanying drawing, in which:

Figure l is an elevational View of an acid pickling bath device embodying the present invention;

Figure 2 is a vertical sectional view through the device shown in Figure 1;

Figure 3 is a horizontal section taken on the line 3 3 of Figure 2; and

Figure 4 is a horizontal section taken substantially on the line 4 4 of Figure 2.

Referring to the drawing, the device shown comprises a main body I0 preferably formed of pottery or suitable ceramic material.

The top of the body IB, which is of generally cylindrical form, is open at II, and toward the bottom the cylindrical wall of the body I0 flares out at I2 and terminates at its lower end in an annular base I3. Spaced above the base IS and at about the bottom of the upper cylindrical part, the body I0 has an internal reflector Iii formed integral therewith. This reiiector is preferably formed of generally semi-spherical or generally 5 parabolic form as shown, and at the axis of the body I0 has an opening I5, the purpose of which will presently appear.

The annular upper edge of the body i0 is downset to form a downset annular ledge I6 for sup- 10 porting the glass beaker or other suitable vessel il. The upper edge of the beaker I7 has an outturned annular flange i9 which rests upon the ledge Iii and suspends the beaker I'I in position concentricaliy within the body i0 and with the 15 bottom wall of the -b-eaker spaced above the reiiector I Il.

This beaker or other vessel Il holds the acid bath which may be a suitable quantity of acid such as hydrochloric, nitric or sulphuric acid, in 20 about fty per cent solution, or in a solution of any percentage to provide the desired pickle. This acid bath is indicated at i8 in Figure 2.

For the purpose of heating the acid bath it,

I provide an incandescent electric lamp 23 oi a g5 rating which, upon completion of the circuit therethrough, will heat the bath I8 to a temperature which I iind sufeient to pickle the articles immersed in the bath, but which lamp at the same time is preferably of a rating not to heat the bath $0 I8 to the boiling point. As illustrative of one commercially satisfactory embodiment of the invention, the lamp 20 is of a rating to bring the bath I8 to a temperature of from about 140 F.

to about F., and preferably not substan- 35 tially above 180 F. This temperature range has been found preferable, but any temperature range which will heat the bath I8 to a temperature to pickle the articles immersed therein without the liberation of excessive vapors or acid fumes may n be employed. The lamp 20 shown in the drawing is a 30 watt 120 volt lamp.

The heat provided by a given lamp heats the bath to a given temperature and avoids fluctuations in the temperature of the bath. These are 4,5 important aspects of the invention.

The lamp E0 has the usual contact base for threaded engagement with a socket 2l carried by a support 22 which is secured at 23 by bolts, screws or the like to the internal ange 2G 50 formed integral with the body I0 sufciently above the bottom of the base I3 so that the iiange 25 of the support 22 and the attachment means at 23 will clear the surface upon which the base I3 rests. The lamp 20 is screwed into the socket 2I 55 from the upper open end il of the body I0, and when in place, is preferably positioned at the focus of the reflector I4. The socket El is provided with any existing or preferred insulated conductor means 26 which extends out through an opening 2l in the body Il] and is provided with a connector 23 for connection with any suitable electric outlet. The conductor 26 is preferably knotted or otherwise formed at 2S within the base of the body ill to relieve the connection between the conductor means and the socket 2l of any pull on the conductors. The device of course, be provided with a suitable switch, but it is deemed sufficient to close and open the circuit through the lamp 20 by merely connecting the conductor means to and disconnecting the same from the electric outlet.

With the acid bath in the vessel I'l, as indicated at I8, and the lamp 253 in position, when the circuit through this lamp is completed it operates to heat the acid bath to a temperature from about F. to about 180 F. This has been found amply adequate to provide the desired pickling or constructions of the class described, these constructions being pickled by immersing the same in the bath I8. At the same time, by limiting the heating of the bath to a temperature below the boiling point of the acid solution, objectionable amounts of vapors or acid fumes are not liberated, and, as a result, the device may be used in dental laboratories and the like without destroying chromium plating, nickel, and other metals in the oiice or laboratory and without offense or danger to the operator. The reector lli provides for eiective utilization of the heat of the lamp 2S, and it will be noted that the main wall of the body lil and the reflector lli forms a double-wall construction adjacent the lamp 29. This doublewall construction reduces loss of heat due to conductivity of the body iii.

Further to suppress the vapors or acid fumes, the top of the body lo is preferably provided with a cover 32 which, like the body if), may be formed of pottery or suitable ceramic material, and has an integral handle 33. The peripheral flange 34 of the cover 32 rests preferably directly upon the upper edge of the body Ill as shown.

The cover 32 is of the casserole type and has an integral annular lip or flange 3S which depends downwardly within the internal diameter of the beaker I1 to return any condensed vapors back into the beaker or vessel l'l. This reduces the loss of such vapors in the operation of the device, and this loss is further reduced by the relatively low temperatures under which the process is carried out in accordance with the present invention.

I do not intend to be limited to the precise details shown or described.

I claim:

i. As a unitary article of manufacture, a recepi'acle for a pickling bath device adapted to receive and support a vessel and an electric lamp including its socket therein, comprisingr an elongated body open at its top and bottom and having a parabolic reflector formed integrally with said body internally thereof and dividing said body into an upper and a lower compartment, said reflector having a central opening therein through which the base of the electric lamp may be projected, and inwardly extending annular anges iormed integrally and internally of said body for supporting said vessel and said socket.

2. As a unitary article of manufacture, a receptacle for a pickling bath device adapted to receive and support a Vessel and an electric lamp including its socket therein, comprising an elongated circular body open at its top and bottom and having a parabolic reflector formed integrally with said body internally thereof and dividing said body into an upper compartment and a lower compartment, said reiiector having a central opening therein, an inwardly extending annular flange formed internally of said body adjacent its open top to support said vessel, and an inwardly extending annular flange formed internally of said body adjacent its open bottom for supporting said socket, the opening in said reflector enabling said electric lamp to have its bulb disposed in the upper compartment and its socket in the lower compartment.

CHARLES F. FRANZWA. 

